San Antonio Rock 'n' Roll Marathon and Half Marathon - Sunday, Dec. 3, 7:30 a.m. Rock ‘n’ Roll San Antonio has become the famous historical landmark-lined course that tours the Tower of the Americas, The Alamo, Mission Concepcion, San Fernando Cathedral and more. Celebrate 20 years of the race in San Antonio. Start on East Commerce 78205; www.runrocknroll.com/san-antonio.